bare-ws

stable

bare-ws — WebSocket library for JavaScript.

npm i bare-ws

Usage

const ws = require('bare-ws')

const server = new ws.Server({ port: 8080 }, (socket) => {
  socket.on('data', (data) => {
    console.log(data.toString())
  })
})

server.on('listening', () => {
  const socket = new ws.Socket({ port: 8080 })

  socket.write('Hello WebSocket')
})

API

Socket

`new Socket(opts: WebSocketOptions)`

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Open a WebSocket connection to url, or wrap an already-connected opts.socket when acting as the server side of a handshake.

Overloads:

new Socket(opts: WebSocketOptions)
new Socket(url: URL | string, opts?: WebSocketOptions)

Parameters

Parameter	Type	Default	Description
`opts`	`WebSocketOptions`	—	Connection options: `host`/`hostname`, `port`, `path`, `secure`, or an already-connected `socket` to wrap.

`ping(data: unknown): void`

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Send a WebSocket ping frame with data as its payload.

Parameters

Parameter	Type	Default	Description
`data`	`unknown`	—	The payload of the ping frame; a string is converted to a `Buffer`.

Throws

NOT_CONNECTED — the socket has not finished connecting.

`pong(data: unknown): void`

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Send a WebSocket pong frame with data as its payload.

Parameters

Parameter	Type	Default	Description
`data`	`unknown`	—	The payload of the pong frame; a string is converted to a `Buffer`.

Throws

NOT_CONNECTED — the socket has not finished connecting.

`Socket.handshake(req: HTTPClientRequest, cb: (error: WebSocketError | null) => void): void`

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Perform the client side of the WebSocket opening handshake over req, calling cb with a WebSocketError if the server's response is invalid.

Parameters

Parameter	Type	Default	Description
`req`	`HTTPClientRequest`	—	The outgoing HTTP request to upgrade; the WebSocket handshake headers are added to it.
`cb`	`(error: WebSocketError \| null) => void`	—	Called once the server's response is validated, with a `WebSocketError` on failure, otherwise `null`.

`Socket.WebSocketEvents`

interface WebSocketEvents extends DuplexEvents {
  ping: [payload: unknown]
  pong: [payload: unknown]
}

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`Socket.WebSocketOptions`

interface WebSocketOptions {
  host?: string
  hostname?: string
  path?: string
  port?: string | number
  secure?: boolean
  socket?: TCPSocket
}

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Server

`new Server(onconnection: (socket: WebSocket, req: HTTPClientRequest) => void)`

_Source

Create a server, optionally backed by opts.server, and emit connection for each successful WebSocket upgrade.

Overloads:

new Server(onconnection: (socket: WebSocket, req: HTTPClientRequest) => void)
new Server(opts?: WebSocketServerOptions, onconnection?: (socket: WebSocket, req: HTTPClientRequest) => void)

Parameters

Parameter	Type	Default	Description
`onconnection`	`(socket: WebSocket, req: HTTPClientRequest) => void`	—	Called on each `'connection'` event.

`address(): TCPSocketAddress`

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Return the bound address of the underlying TCP server.

`close(cb?: (err?: Error | null) => void): this`

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Stop the server from accepting new connections, calling cb once it has closed.

Parameters

Parameter	Type	Default	Description
`cb?`	`(err?: Error \| null) => void`	—	Called once the underlying server has closed.

`listening: boolean`

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true once the underlying server is bound and accepting connections.

`ref(): this`

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Ref the underlying server so it keeps the event loop alive.

`Server.handshake(req: HTTPClientRequest, cb: (err: WebSocketError | null) => void): void`

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Perform the server side of the WebSocket opening handshake for req, writing the 101 upgrade response on socket and calling cb with a WebSocketError on failure.

Overloads:

Server.handshake(req: HTTPClientRequest, cb: (err: WebSocketError | null) => void): void
Server.handshake(req: HTTPClientRequest, socket: TCPSocket, cb?: (err: WebSocketError | null) => void): void
Server.handshake(req: HTTPClientRequest, socket?: TCPSocket, head?: Buffer, cb?: (err: WebSocketError | null) => void): void

Parameters

Parameter	Type	Default	Description
`req`	`HTTPClientRequest`	—	The incoming upgrade request.
`cb`	`(err: WebSocketError \| null) => void`	—	Called with a `WebSocketError` if the request is not a valid WebSocket upgrade, otherwise `null`.

`Server.WebSocketServerEvents`

interface WebSocketServerEvents extends DuplexEvents {
  connection: [socket: WebSocket, req: HTTPClientRequest]
  listening: []
}

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`Server.WebSocketServerOptions`

interface WebSocketServerOptions extends HTTPServerConnectionOptions, HTTPSServerConnectionOptions {
  secure?: boolean
}

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`unref(): this`

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Unref the underlying server so it does not keep the event loop alive on its own.

`bare-ws/global`

Types

`WebSocketConstructor`

type WebSocketConstructor = typeof ws.Socket

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The type of the Socket class, used to type the global WebSocket constructor.

`bare-ws/constants`

Constants and variables

`EOL: string`

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The line ending (\r\n) used when writing the handshake response.

`EOF: string`

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The blank-line terminator (\r\n\r\n) that ends the handshake response headers.

`GUID: Buffer`

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The WebSocket protocol's fixed GUID, concatenated with the Sec-WebSocket-Key to compute the Sec-WebSocket-Accept digest.

`opcode`

opcode: {
  CONTINUATION: number
  TEXT: number
  BINARY: number
  CLOSE: number
  PING: number
  PONG: number
}

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The WebSocket frame opcodes (CONTINUATION, TEXT, BINARY, CLOSE, PING, PONG) as defined by RFC 6455.

`status: { PROTOCOL_ERROR: number; MESSAGE_TOO_LARGE: number }`

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WebSocket close status codes for protocol errors (PROTOCOL_ERROR) and oversized messages (MESSAGE_TOO_LARGE).

`bare-ws/errors`

WebSocketError

`WebSocketError`

new WebSocketError(msg: string, code: string, status: number, fn?: WebSocketError, cause?: unknown)

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An error thrown for WebSocket protocol violations, carrying a code and a close status.

Parameters

Parameter	Type	Default	Description
`msg`	`string`	—	The error message.
`code`	`string`	—	The error code.
`status`	`number`	—	The WebSocket close status associated with the error.
`fn?`	`WebSocketError`	—	Optional function to omit from the top of the generated stack trace, passed to `Error.captureStackTrace`.
`cause?`	`unknown`	—	The underlying cause of the error, if any.

`WebSocketError.EXPECTED_CONTINUATION(msg?: string): WebSocketError`

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A fragmented message's next frame was not a continuation frame.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'EXPECTED_CONTINUATION', for the caller to throw.

`WebSocketError.EXPECTED_MASK(msg?: string): WebSocketError`

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A frame from a client was missing its required mask.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'EXPECTED_MASK', for the caller to throw.

`WebSocketError.INCOMPLETE_FRAME(msg?: string, length?: number): WebSocketError`

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The buffered data does not yet contain a full frame.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.
`length?`	`number`	—	The total byte length the frame needs before it can be decoded, stored as the error `status` (default `-1`).

Returns WebSocketError — A WebSocketError with code set to 'INCOMPLETE_FRAME' and status set to length, for the caller to throw.

`WebSocketError.INVALID_ACCEPT_HEADER(msg?: string): WebSocketError`

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The Sec-WebSocket-Accept header in the server's handshake response did not match the expected digest.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_ACCEPT_HEADER', for the caller to throw.

`WebSocketError.INVALID_ENCODING(msg?: string): WebSocketError`

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Data was written with an encoding other than buffer or utf8.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_ENCODING', for the caller to throw.

`WebSocketError.INVALID_KEY_HEADER(msg?: string): WebSocketError`

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The Sec-WebSocket-Key header was missing or malformed.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_KEY_HEADER', for the caller to throw.

`WebSocketError.INVALID_OPCODE(msg?: string): WebSocketError`

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A frame was received with an opcode that is not TEXT or BINARY.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_OPCODE', for the caller to throw.

`WebSocketError.INVALID_PAYLOAD_LENGTH(msg?: string): WebSocketError`

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A frame's payload length field was invalid.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_PAYLOAD_LENGTH', for the caller to throw.

`WebSocketError.INVALID_UPGRADE_HEADER(msg?: string): WebSocketError`

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The Upgrade header was missing or not websocket.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_UPGRADE_HEADER', for the caller to throw.

`WebSocketError.INVALID_VERSION_HEADER(msg?: string): WebSocketError`

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The Sec-WebSocket-Version header was neither 8 nor 13.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'INVALID_VERSION_HEADER', for the caller to throw.

`WebSocketError.NETWORK_ERROR(msg: string, cause?: unknown): WebSocketError`

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The underlying HTTP request errored before the handshake completed.

Parameters

Parameter	Type	Default	Description
`msg`	`string`	—	The error message.
`cause?`	`unknown`	—	The underlying error.

Returns WebSocketError — A WebSocketError with code set to 'NETWORK_ERROR', for the caller to throw.

`WebSocketError.NOT_CONNECTED(msg?: string): WebSocketError`

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An operation, such as ping() or pong(), was attempted before the socket finished connecting.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'NOT_CONNECTED', for the caller to throw.

`WebSocketError.UNEXPECTED_CONTINUATION(msg?: string): WebSocketError`

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A continuation frame was received without a preceding fragmented frame.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'UNEXPECTED_CONTINUATION', for the caller to throw.

`WebSocketError.UNEXPECTED_CONTROL(msg?: string): WebSocketError`

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A control frame was received while a fragmented message was in progress.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'UNEXPECTED_CONTROL', for the caller to throw.

`WebSocketError.UNEXPECTED_RSV1(msg?: string): WebSocketError`

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A frame was received with the reserved RSV1 bit set.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'UNEXPECTED_RSV1', for the caller to throw.

`WebSocketError.UNEXPECTED_RSV2(msg?: string): WebSocketError`

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A frame was received with the reserved RSV2 bit set.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'UNEXPECTED_RSV2', for the caller to throw.

`WebSocketError.UNEXPECTED_RSV3(msg?: string): WebSocketError`

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A frame was received with the reserved RSV3 bit set.

Parameters

Parameter	Type	Default	Description
`msg?`	`string`	—	The error message.

Returns WebSocketError — A WebSocketError with code set to 'UNEXPECTED_RSV3', for the caller to throw.

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